Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K1/00—Details of the magnetic circuit
  • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
  • H02K1/12—Stationary parts of the magnetic circuit
  • H02K1/17—Stator cores with permanent magnets
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
  • F02N11/00—Starting of engines by means of electric motors

Definitions

• the invention is based on an electrical machine, in particular for starting devices for internal combustion engines, according to the preamble of the main claim.
• An electrical machine is already known in which the permanent magnets are held in the housing by retaining springs.
• the retaining springs are arranged between two adjacent permanent magnets and have resilient spring arms and fixing means on one end of the permanent magnets, in order to hold the permanent magnets in the correct position in the housing. Due to the targeted vault effect, no additional fastening of the permanent magnets in the housing is required in this known embodiment.
• the permanent magnets are provided with associated flux guide pieces in the known electric machine, then such large radial forces act on the flux guide pieces in the direction of the armature that the retaining springs must additionally be fastened in the housing with at least one rivet in order to piece the permanent magnets together with the flux guide to keep in the housing.
• Such a fastening of the permanent magnets with the associated flux guide pieces has the disadvantage that it requires numerous fastening parts in the form of retaining springs and rivets and, together with high assembly costs, is no longer economical.
• the invention has for its object to provide an electrical machine of the type mentioned, in which the permanent magnets together with flux guide pieces can be arranged and fastened safely, but detachably in the housing with simple means.
• the ring-shaped holding parts allow positive locking of permanent magnets and flux guide pieces and pre-assembly of the magnet group.
• the holding parts form a mechanical protection of the magnets when the armature is inserted into the housing of the electrical machine.
• the measures listed in the subclaims allow advantageous developments of the electrical machine specified in the main claim. Especially It is advantageous to form holding, fixing and tolerance-compensating means on the ring-shaped holding parts, with which one ring can be releasably latched onto housing projections, while the other ring has resilient projections to compensate for the relatively large manufacturing tolerances in the longitudinal direction.
• the ring-shaped holding parts can be made of spring steel, a tough elastic, heat-resistant plastic or light metal.
• FIG. 1 shows the housing of an electrical machine in longitudinal section
• FIG. 2 shows a view in the direction of arrow II
• FIG. 3 shows a view in the direction of arrow III in each case in FIG. 1.
• radially protruding locking lugs 3 are formed on the inner wall 2 in a plane perpendicular to the longitudinal axis of the housing 1 - for example by stamping.
• a magnet group is detachably inserted in the housing 1.
• the magnet group is formed from three pairs of permanent magnets, each permanent magnet 4 to 9 being assigned a flux guide 10 to 15.
• the permanent magnets 4 to 9 are curved so that their outside is adapted to the inner wall 2 of the housing 1.
• the flux guide piece 10 to 15 assigned to a permanent magnet k to 9 bears against one or the other longitudinal side 16 or 17 of the permanent magnet k to 9.
• the permanent magnets 4 to 9 together with flux guide pieces 10 to 15 are preassembled as a magnet group by means of two resilient holding parts.
• the holding parts consist of two rings 18 and 19, for example made of spring steel.
• the rings can also be formed as molded parts made of tough elastic plastic or light metal such as aluminum.
• the ring 18 has a cylindrical portion 20 on each of which an edge portion of the inside 21 and 22 of the permanent magnets 4 to 9 or the Flußleit pieces 10 to 15, which is on an end face 23 and 24 of the permanent magnets 4 to 9, or the flux guide pieces Borders 10 to 15.
• the ring 18 has a flange-like edge 25 which extends perpendicular to the cylindrical portion 20 on the end face 23 or 2k of the permanent magnets 5 to 9 and the flux guide pieces 10 to 15 and abuts the end faces 23, 2k. From the edge 25 tabs 26 and 27 are punched out and bent to the free longitudinal side 17 of one of the permanent magnets 4 to 9 or to one of the associated permanent magnets 4 to 9 facing away from the longitudinal side 28 of one of the Flußleit pieces 10 to 15. By the edge 25 and the tabs 26 and 27, the permanent magnets 4 to 9 together with Flußleit pieces 10 to 15 in the longitudinal and circumferential direction in their position to each other. Moreover the flux guide pieces 10 to 15 are held in a form-fitting manner on the respectively associated permanent magnet 4 to 9 by the tabs 26, 27.
• the ring 19 also has a cylindrical section 30. An edge section of the inside 21 and 22 of the permanent magnets 4 to 9 or the flux guide pieces 10 to 15 is received on it, which edge section 31 and 32 of the permanent magnets 4 to 9, or the flow guide borders 10 to 15.
• the ring 19 also has a flange-like edge 33. Flaps 34 and 35 are also punched out of the edge 33 and bent on the long side 17 of the permanent magnets 4 to 9 and on the long side 28 of the flux guide pieces 10 to 15.
• the rings 18, 19 form a mechanical protection when joining the magnet group into the housing 1, especially for the end face regions of the magnet group 4 to 15.
• the housing 1 is covered with respect to the end faces 23 and 24 and with respect to the edge 25 of the ring 18 with an intermediate bearing 42 on which the spring arms 29 of the ring 18 are supported.
• the intermediate bearing 42 serves in a manner known per se and not shown in more detail as a bearing point for the armature shaft of the electrical machine, which is also known per se and not shown in detail.
• the intermediate bearing 42 is provided on the circumference with spring tongues 43, which are arranged and fixed between the end faces of the housing 1 and a drive bearing 44 in a manner known per se.
• the drive bearing 44 and a commutator bearing (not shown) arranged on the end face 45 of the housing 1 are fastened to the housing 1 by tie rods 46.
• the drive bearing is arranged directly on the housing 1 and the spring arms 29 are then supported on the drive bearing.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Permanent Field Magnets Of Synchronous Machinery (AREA)
• Motor Or Generator Frames (AREA)
• Ignition Installations For Internal Combustion Engines (AREA)
• Dc Machiner (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6285614

Family Applications (1)

Country Status (7)

Families Citing this family (22)

Citations (3)

Family Cites Families (13)

• 1985
  • 1985-11-09 DE DE19853539851 patent/DE3539851A1/de not_active Withdrawn
• 1986
  • 1986-09-23 DE DE8686905721T patent/DE3677024D1/de not_active Expired - Lifetime
  • 1986-09-23 BR BR8607208A patent/BR8607208A/pt not_active IP Right Cessation
  • 1986-09-23 US US07/086,698 patent/US4748358A/en not_active Expired - Lifetime
  • 1986-09-23 WO PCT/DE1986/000386 patent/WO1987003148A1/de active IP Right Grant
  • 1986-09-23 JP JP61504986A patent/JP2536858B2/ja not_active Expired - Fee Related
  • 1986-09-23 EP EP86905721A patent/EP0282477B1/de not_active Expired - Lifetime
  • 1986-11-07 MX MX004294A patent/MX168458B/es unknown

Patent Citations (3)

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